Interesting question, I'm not sure. I start with a transparent, blank doc saved as a Photoshop PDF, and then I use FPDI/FPDF in PHP to add the white text. That's the doc.
On Jun 17, 2011, at 7:25 AM, Chris Liddell wrote:
> Do you mean that the PDFs use the PDF transparency capabilities for the
> background? Or that the background is just "not marked"?
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